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Open data
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Basic information
Entry | Database: PDB / ID: 8drq | ||||||
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Title | LRRC8A:C conformation 1 (round) LRR focus 3 | ||||||
![]() | Volume-regulated anion channel subunit LRRC8A,Soluble cytochrome b562 | ||||||
![]() | MEMBRANE PROTEIN / ION CHANNEL / VOLUME-REGULATION | ||||||
Function / homology | ![]() Miscellaneous transport and binding events / pre-B cell differentiation / volume-sensitive anion channel activity / taurine transmembrane transport / aspartate transmembrane transport / cyclic-GMP-AMP transmembrane transporter activity / cyclic-GMP-AMP transmembrane import across plasma membrane / monoatomic anion transmembrane transport / cell volume homeostasis / protein hexamerization ...Miscellaneous transport and binding events / pre-B cell differentiation / volume-sensitive anion channel activity / taurine transmembrane transport / aspartate transmembrane transport / cyclic-GMP-AMP transmembrane transporter activity / cyclic-GMP-AMP transmembrane import across plasma membrane / monoatomic anion transmembrane transport / cell volume homeostasis / protein hexamerization / monoatomic anion transport / response to osmotic stress / monoatomic ion channel complex / intracellular glucose homeostasis / positive regulation of myoblast differentiation / chloride transmembrane transport / electron transport chain / positive regulation of insulin secretion / spermatogenesis / periplasmic space / electron transfer activity / iron ion binding / lysosomal membrane / heme binding / cell surface / identical protein binding / plasma membrane / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.16 Å | ||||||
![]() | Kern, D.M. / Brohawn, S.G. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis for assembly and lipid-mediated gating of LRRC8A:C volume-regulated anion channels. Authors: David M Kern / Julia Bleier / Somnath Mukherjee / Jennifer M Hill / Anthony A Kossiakoff / Ehud Y Isacoff / Stephen G Brohawn / ![]() Abstract: Leucine-rich repeat-containing protein 8 (LRRC8) family members form volume-regulated anion channels activated by hypoosmotic cell swelling. LRRC8 channels are ubiquitously expressed in vertebrate ...Leucine-rich repeat-containing protein 8 (LRRC8) family members form volume-regulated anion channels activated by hypoosmotic cell swelling. LRRC8 channels are ubiquitously expressed in vertebrate cells as heteromeric assemblies of LRRC8A (SWELL1) and LRRC8B-E subunits. Channels of different subunit composition have distinct properties that explain the functional diversity of LRRC8 currents across cell types. However, the basis for heteromeric LRRC8 channel assembly and function is unknown. Here we leverage a fiducial-tagging strategy to determine single-particle cryo-EM structures of heterohexameric LRRC8A:C channels in multiple conformations. Compared to homomers, LRRC8A:C channels show pronounced differences in architecture due to heterotypic LRR interactions that displace subunits away from the conduction axis and poise the channel for activation. Structures and functional studies further reveal that lipids embedded in the channel pore block ion conduction in the closed state. These results provide insight into determinants for heteromeric LRRC8 channel assembly, activity and gating by lipids. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 112.6 KB | Display | ![]() |
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PDB format | ![]() | 73 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 27681MC ![]() 8dr8C ![]() 8draC ![]() 8dreC ![]() 8drkC ![]() 8drnC ![]() 8droC ![]() 8ds3C ![]() 8ds9C ![]() 8dsaC ![]() 8f74C ![]() 8f75C ![]() 8f77C ![]() 8f79C ![]() 8f7bC ![]() 8f7dC ![]() 8f7eC ![]() 8f7jC C: citing same article ( M: map data used to model this data |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
#1: Protein | Mass: 105530.102 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: LRRC8A:C / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Value: 0.620 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.4 |
Specimen | Conc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: TFS KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: -2 nm / Nominal defocus min: -0.6 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||
3D reconstruction | Resolution: 4.16 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 110018 / Symmetry type: POINT | |||||||||
Refinement | Cross valid method: NONE |